A couple has sons who are colourblind with AB | vedclass

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(A) Colour blindness is a recessive sex-linked trait carried on the $X$-chromosome. In males, a single recessive gene $(X^c Y)$ is sufficient for expr

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Mother colourblind with $A$ blood group, and father normal with blood group-$B$.

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(A) Colour blindness is a recessive sex-linked trait carried on the $X$-chromosome. In males, a single recessive gene $(X^c Y)$ is sufficient for expression, while females require two recessive genes $(X^c X^c)$.To have sons with $AB$ blood group and colour blindness, the mother must contribute an $X^c$ chromosome and an $I^A$ allele, while the father must contribute a $Y$ chromosome and an $I^B$ allele.Based on the provided cross:Parents: Mother $(X^c X^c I^A I^A)$ $	imes$ Father $(X Y I^B I^B)$Gametes: Mother $(X^c I^A)$, Father $(X I^B, Y I^B)$Offspring: $X^c X I^A I^B$ (Daughter, carrier, $AB$ blood group) and $X^c Y I^A I^B$ (Son, colourblind, $AB$ blood group).Thus, the mother is colourblind with blood group $A$ and the father is normal with blood group $B$.

List $I$	List $II$
$A$. Two or more alternative forms of a gene	$I$. Backcross
$B$. Cross of $F_1$ progeny with homozygous recessive parents	$II$. Ploidy
$C$. Cross of $F_1$ progeny with any of the parents	$III$. Allele
$D$. Number of chromosome sets in plant	$IV$. Test cross

Column-$I$	Column-$II$
$(w)$ Blood group	$(a)$ Polygenic inheritance
$(x)$ Skin colour	$(b)$ Aneuploidy
$(y)$ Mendelian disorder	$(c)$ Incomplete dominance
$(z)$ Chromosomal disorder	$(d)$ Sickle-cell anaemia
	$(e)$ Co-dominance

$A$ couple has sons who are colourblind with $AB$ blood group. Identify the parents from the following.

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Match the following columns.

Column-$I$ Column-$II$

$(w)$ Blood group $(a)$ Polygenic inheritance

$(x)$ Skin colour $(b)$ Aneuploidy

$(y)$ Mendelian disorder $(c)$ Incomplete dominance

$(z)$ Chromosomal disorder $(d)$ Sickle-cell anaemia

$(e)$ Co-dominance

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